Business Combinations - Additional Information (Details)		12 Months Ended
	Jan. 20, 2023 USD ($) loan	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)
Goodwill		$ 50,727,000	$ 50,727,000
Citizens Bank
Identifiable intangible assets	$ 24,645,000
Goodwill	23,438,000
Goodwill tax deductible	0
Third-party acquisition-related costs incurred		$ 0	$ 95,000	$ 4,900,000
Business Combination, Separately Recognized Transaction, Acquisition-Related Cost, Expensed, Statement of Income or Comprehensive Income [Extensible Enumeration]		Noninterest Expense	Noninterest Expense	Noninterest Expense
Loan portfolio	461,500,000
Fair value discount	14,100,000
Fair value	419,500,000
Gross	$ 520,000,000
Number of PCD loans identified | loan	48
PCD loans	$ 27,481,000
Citizens Bank | Core Deposits
Identifiable intangible assets	$ 22,100,000
Acquired intangible assets useful life (in years)	10 years
Citizens Bank | Acquired trust and wealth management
Identifiable intangible assets	$ 2,600,000
Acquired intangible assets useful life (in years)	10 years